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General| Brand | JVC |
|---|---|
| Model | DD-9 A |
| Category | Cassette Player |
| Language | English |
Features a newly developed quartz-locked pulse-servo DD motor for capstan drive and a DC motor for reel drive.
Utilizes SA record/playback heads for sensitivity and an erase head for efficiency.
Provides significant noise reduction and MOL improvement with fewer side effects.
Automated system for optimizing Bias, Equalization, and Sensitivity for tape.
Guidelines for cleaning heads, capstan, pinch roller, and cabinet.
Procedure to demagnetize heads to prevent excess noise.
Details the quartz-locked pulse servo DD motor for precise capstan drive.
Directly coupled stages reduce capacitors for improved sound quality.
Lists necessary equipment for electrical and mechanical adjustments.
Procedures for mechanical adjustments before electrical ones.
Detailed steps for aligning record/playback heads.
Diagram showing adjustment points on the main amplifier board.
Diagram showing adjustment points on the computer board.
Procedure for calibrating Dolby C playback circuitry.
Steps to adjust playback output levels.
Checking and adjusting frequency response.
Specifies checker connections and switch positions for adjustments.
Procedure for adjusting the computer clock frequency.
Verifying computer preset values against a table.
Adjusting the A/D converter counter and waveform.
Procedure for setting bias levels for different tape types.
Block diagram illustrating the mechanical control circuitry.
Block diagram of the main signal processing and computer circuits.
Block diagram for the fluorescent level meter.
Block diagram illustrating the Dolby C noise reduction system.
Wiring diagram for the main amplifier section.
Information on the ICs used for Dolby C Noise Reduction.
Details on the IC for headphone and meter amplification.
Information on the IC controlling the mechanical functions.
Schematic diagram of the mechanical control section.
Schematic diagram for the front panel FL display circuit.
Schematic diagram of the direct drive motor control circuit.
Schematic diagram of the main audio amplifier circuitry.
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